If you're using a S60 phone from Nokia, watch out. Kaspersky Labs has just discovered the first trojan, Troja-SMS.Symb.OS.Viver, that will affect the S60 OS. If you mistakenly download this from the internet and install this on your phone—which is easy to do, since it's mislabeled and disguised as a useful photo editor or video codec pack—the virus will start sending out SMS messages like nobody's business.

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Why should you care? Because these SMSes are sent to premium ringtone downloads and other services, which will cost you between $1 and $10 per message. Ouch.

If you really want to keep your phone safe from Trojans, check out the video above from our time at CES.